14mm Male . Terp Slurpers Smoking Tube Joint With Random Color Glass Marble Short Style Bottom OD:28mm Banger Outer Diameter: 22mm Thickness of bottom:4mm Reliable Quality:100%Made of quartz crystal,High Heat Resistance，Quartz glass can be used at 1100℃ for a long time Good light transmission. The visible light transmittance is above 92% Safe to use: quartz crystal:Quartz is made of natural crystal and silica High temperature resistance：Quartz glass can be used at 1100°C for a long time. Good thermal stability. Quartz glass has a very small coefficient of thermal expansion can withstand severe temperature changes, and is stable at high temperatures. preservative. In addition to hydrofluoric acid, quartz glass hardly reacts with other acids.